I saw this one several weeks ago, and yes it is one of the very respectful horror films in recent year. It has similarities to the legendary Deliverance, except that the bad guys here are not hilly billies but a group of young deviants, as in the "Them" that released two years back. Basically, the attackers become the peoples (replacing monster or evil spirits in other horror flicks) that you should fear about. No matter how intelligence you are, or strong and better you are than those bad guys, they just somehow even better and beat you senseless. They shown no remorse, no qualm in cutting off piece by piece of your beloved ones and then laughed gleefully in your face.